Perpetual calendar



UNITED STATES PATENT EEICE.

THOMAS A. MCKEE, OF BELOIT, KANSAS.

PERPETUAL CALENDAR.

SPECIFICATION forming part of Letters Patent No. 398,172, dated February19, 1889.

Application filed May 29, 1888. Serial No. 275,507. (No model.)

To all whom it 17mg/ concern.'

Be it known that I, THOMAS A. MCKEE, a citizen or" the United States,residing at Beloit, in t-he county of Mitchell and State of Kansas, haveinvented new and useful Improvements in Perpetual Calendars, of whichthe following is a specification.

My invention relates to improvements in perpetual calendars, having forits object to provide (in combination with a calendar) a table to showthe relation of night to day in the various parts of the year; and itconsists in a certain novel construction and arrangement of devices,fully set forth hereinafter in connection with the accompanyingdrawings, wherein* Figure l is a face or front view of the improvedcalendar. Fig. is a rear view of the same. Fig. il is a vertical centralsectional View thereof. Fig. 4 is a view of the yeardisk detached.

Referring to the drawings, A designates the body of the calendar, whichmay be of any preferred form or ornamental design, in which is formed,the opening B; and C represents a circular table of the days of theweek, live weeks being represented in the table. IVithin the said tableis mounted, upon asuitable pivot, a disk, D, the periphery of which isdivided into thirty-five spaces, to align, respectively, with thethirty-iive days represented on the day-table. The thirty-one days ofthe month are represented by figures in the spaces on the disk D,leaving four vacant spaces which are covered by the segment of a disk,Il, which is a section of a disk in the form of a sector, and is mountedon the same pivot as the disk D. When a month has less than thirty-onedays, the said segment of a disk is moved to cover the unnecessaryfigures.

A series of perforations, F, are formed in the edge of the disk I), anda spring-catch, G, is attached to the body and is adapted to engageeither of the said perforations to lock thedisk in the desired position,it being evident that the disk must be adjusted each month in order tobring the irst day of the month on the proper day of the week.

A disk, I-I, is mounted on the rear side of the body, and its peripheryis divided into a series of spaces, h 7i, (preferably thirteen innumber,) in which are the names of the months of the year, (two spacesbeing allotted to February.) Only one of these spaces is visible at atime through the opening B, and each space is divided into a dark and alight section, the relative sizes of which differ in differents parts ofthe year. The dark section is designed to represent Night and the lightsect-ion Day, so that their relative sizes indicate the relation betweenthe day and night in the various parts of the year. The year-disk ismoved on the last daf,T of each month, to bring a diierent monthopposite the opening in the body; hence the two spaces designatedFebruary, one being for use in leap-year.

The periphery of the year-disk is provided with perforations I I, inwhich the springcatch I( engages to lock the disk in the desiredposition.

I claim- In a perpetual calendar, the combination of the body providedwith a circular day-table, C, and an opening, B, the revoluble monthdiskconcentric with the day-table and containing thirty-one days, thesegment of a disk, E, concentric with and arranged on the monthdisk, andadapted to cover the extra days in months containing less thanthirty-one days, theV year-disk mounted on the rear side of the body andprovided with spaces containing' the names of the months, which spacesare partly darkened to indicate the relation between the night and dayin the indicated month, one of said spaces being adapted to be exposedthrough the opening B at all times, substantially as specied. y

In testimony that I claim the foregoing as my own I have hereto aiiiXedmy signature in presence of two witnesses.

THOMAS A. MCKEE.

Vitnesses:

J. E. TICE, S. M. EWING.

